Gas Grill Smoke Cones, turn your barbecue into a smoker, available in different flavors.Fish and meats like salmon, tuna, and pork chops, only cook for 5 to 10 minutes, not long enough to smoke with wood chips. Using the smoke cones in your grill, you can cold smoke food then light your grill and cook it. Gas Grill Smoke Cones seal in real wood flavor and juices.